The idea behind building Amazon Go was to push the boundaries of computer vision and machine learning to create a store where customers could simply take what they want and go. Aside from Seattle, Los Angeles is also a possible location of another cashierless store. The Seattle store has got cameras and multiple sensors that track customers as well as the inventories when they move around.

Reports hint at other location possibilities. It is recently reported that Amazon had its eye on an Amazon Go location in San Francisco's Union Square neighborhood. When they leave, they just leave.

Customers simply have to download the Amazon Go app and scan a unique barcode that automatically identifies them when they walk into a store.

The system, which Amazon calls "just walk out shopping", ran into some technical difficulties during almost 14 months of employee-only trials, people familiar with the matter said.